gh-105751: test_ctypes avoids "from ctypes import *" (#105768)

Using "import *" prevents linters like pyflakes to detect undefined names
(usually missing imports).

Replace c_voidp with c_void_p.

Author: vstinner

Lib/ctypes/_endian.py

@@ -1,5 +1,5 @@
 import sys
-from ctypes import *
+from ctypes import Array, Structure, Union
 
 _array_type = type(Array)
 

Lib/test/test_ctypes/test_anon.py

@@ -1,6 +1,6 @@
 import unittest
 import test.support
-from ctypes import *
+from ctypes import c_int, Union, Structure, sizeof
 
 class AnonTest(unittest.TestCase):
 

Lib/test/test_ctypes/test_array_in_pointer.py

@@ -1,5 +1,5 @@
 import unittest
-from ctypes import *
+from ctypes import c_byte, Structure, POINTER, cast
 from binascii import hexlify
 import re
 

Lib/test/test_ctypes/test_arrays.py

@@ -2,7 +2,10 @@
 import sys
 import unittest
 import warnings
-from ctypes import *
+from ctypes import (Structure, Array, sizeof, addressof,
+                    create_string_buffer, create_unicode_buffer,
+                    c_char, c_wchar, c_byte, c_ubyte, c_short, c_ushort, c_int, c_uint,
+                    c_long, c_ulonglong, c_float, c_double, c_longdouble)
 from test.support import bigmemtest, _2G
 
 from test.test_ctypes import need_symbol

Lib/test/test_ctypes/test_as_parameter.py

@@ -1,8 +1,12 @@
-import unittest
+import _ctypes_test
 import ctypes
-from ctypes import *
+import unittest
+from ctypes import (Structure, CDLL, CFUNCTYPE,
+                    POINTER, pointer, byref,
+                    c_short, c_int, c_long, c_longlong,
+                    c_byte, c_wchar, c_float, c_double,
+                    ArgumentError)
 from test.test_ctypes import need_symbol
-import _ctypes_test
 
 dll = CDLL(_ctypes_test.__file__)
 

Lib/test/test_ctypes/test_bitfields.py

@@ -1,4 +1,8 @@
-from ctypes import *
+from ctypes import (CDLL, Structure, sizeof, POINTER, byref, alignment,
+                    LittleEndianStructure, BigEndianStructure,
+                    c_byte, c_ubyte, c_char, c_char_p, c_void_p, c_wchar,
+                    c_uint32, c_uint64,
+                    c_short, c_ushort, c_int, c_uint, c_long, c_ulong, c_longlong, c_ulonglong)
 from test.test_ctypes import need_symbol
 from test import support
 import unittest

Lib/test/test_ctypes/test_buffers.py

@@ -1,4 +1,5 @@
-from ctypes import *
+from ctypes import (create_string_buffer, create_unicode_buffer, sizeof,
+                    c_char, c_wchar)
 from test.test_ctypes import need_symbol
 import unittest
 

Lib/test/test_ctypes/test_bytes.py

@@ -1,7 +1,7 @@
 """Test where byte objects are accepted"""
-import unittest
 import sys
-from ctypes import *
+import unittest
+from ctypes import Structure, c_char, c_char_p, c_wchar, c_wchar_p
 
 class BytesTest(unittest.TestCase):
     def test_c_char(self):

Lib/test/test_ctypes/test_byteswap.py

@@ -1,7 +1,13 @@
 import sys, unittest, struct, math, ctypes
 from binascii import hexlify
 
-from ctypes import *
+from ctypes import (Structure, Union, LittleEndianUnion, BigEndianUnion,
+                    BigEndianStructure, LittleEndianStructure,
+                    POINTER, sizeof, cast,
+                    c_byte, c_ubyte, c_char, c_wchar, c_void_p,
+                    c_short, c_ushort, c_int, c_uint,
+                    c_long, c_ulong, c_longlong, c_ulonglong,
+                    c_uint32, c_float, c_double)
 
 def bin(s):
     return hexlify(memoryview(s)).decode().upper()

Lib/test/test_ctypes/test_callbacks.py

@@ -3,7 +3,12 @@
 from test import support
 
 import ctypes
-from ctypes import *
+from ctypes import (CDLL, cdll, Structure, CFUNCTYPE,
+                    ArgumentError, POINTER, sizeof,
+                    c_byte, c_ubyte, c_char, c_char_p,
+                    c_short, c_ushort, c_int, c_uint,
+                    c_long, c_longlong, c_ulonglong, c_ulong,
+                    c_float, c_double, c_longdouble, py_object)
 from test.test_ctypes import need_symbol
 from _ctypes import CTYPES_MAX_ARGCOUNT
 import _ctypes_test